JP4654326B2 - Spray dampener device for printing press - Google Patents

Description

  The present invention relates to a spray dampener device for supplying dampening water to a lithographic printing press. The present invention relates to a spray dampener device for a printing press.

  A spray dampener device is generally used as a dampening water supply method for lithographic printing presses, particularly newspaper rotary presses. Ink mist, paper powder, dust, etc. scattered or floating in the printing factory accumulates over time at least around the nozzle nozzle in the spray unit, or in addition to the nozzle nozzle circumference, on the surface near the nozzle and the inner wall of the nozzle. Accumulation over time causes the spray pattern to be disturbed, resulting in poor printing, and maintenance of the spray nozzle, which is time consuming and labor intensive, or replacement of a new expensive nozzle is periodically performed.

  In the case of a double-sided multi-color printing machine, particularly in a newspaper printing machine, the width is generally around 1700 mm, and a double-sided 4-color printing machine requires 8 spray units, each of which has 8 spray nozzles. have. In addition to the overall width of the spray unit, it is quite heavy, so when replacing or maintaining the spray nozzle, two or more workers are usually required to remove the spray unit from the press, remove the spray nozzle, and clean it. Rework, inspection, adjustment, and time-consuming work of installing the spray unit on the printing machine are necessary, which has been a problem in terms of productivity and occupational safety. In a printing machine that is generally called 4-high and stacks the printing units vertically, the scaffold becomes higher each time the second, third, fourth, and printing units are stacked, and the above maintenance work is dangerous. It becomes work with. In newspaper printers or commercial printers with narrow widths, the weight of the spray unit is relatively reduced in both double-sided and single-sided printing, but it still has the problem of troublesome nozzle maintenance or replacement of new products, which takes time and labor. ing.

  The main cause of the above-mentioned spray nozzle contamination is that paper dust, dust, and ink mist attracted to the vicinity of the nozzle injection port due to the movement of air generated by the spray injection in the spray unit contact the nozzle and accumulate. As a conventional solution, as disclosed in the cited document 1, the shape around the spray injection port is devised to change the air flow generated along with the spray injection, so that the causative substance of dirt accumulates in the vicinity of the nozzle injection port. Or, as disclosed in the cited document 2, the spray nozzle is covered with an air cap having an opening so as to make it difficult for a causative substance to enter the air cap. These measures have shown an effect of reducing the accumulation of contamination-causing substances in the vicinity of the nozzle outlet, and contributed to the reduction in the number of necessary maintenance, but the air was not completely shut off, so it was not a fundamental solution, and maintenance was not possible. Is currently spending time and effort.

  In addition, a structure in which a superhydrophilic substance is attached to the outer peripheral surface of the tip of the liquid supply nozzle is disclosed in Citation 3, but the spray dampener in the offset printing machine is in an environment where the nozzle is shielded from light, Because it is used continuously for a very long time every day, the nozzle structure is simply sprayed with superhydrophilic material on the outer peripheral surface of the liquid supply nozzle tip, and paper dust, dust, ink mist, etc. floating in the printing factory are ejected from the nozzle. It cannot solve the peculiar problem in the printing field that it accumulates in the vicinity of the mouth with time and disturbs the spray pattern.

Patent Document 1: Japanese Patent Laid-Open No. 2005-153513 Patent Document 2: Japanese Patent Laid-Open No. 2007-521129 Patent Document 3: Japanese Patent Laid-Open No. 10-256116

  The problem to be solved is that time and labor are spent for maintenance such as nozzle replacement or cleaning, and troubles during printing such as printing failure and print quality deterioration due to nozzle clogging cannot be prevented.

In order to achieve the above object, the present invention provides a dampening solution in which the opposite side close to the surface of the dampening roller is opened along the longitudinal direction of the dampening roller and the front side of the spray nozzle is opened in combination with the offset printing press. A spray unit having a housing structure that covers the spray region, the spray nozzle, and the light source, and a plurality of spray nozzles that are provided inside the spray unit housing and spray dampening water toward the surface of the dampening roller. A spray dampener device for a printing press,
Photocatalyst is arranged around the spray injection port of the spray nozzle, outside the light source spraying angle of the spray nozzle for applying light to the photocatalyst, and is disposed within the housing, the contaminants to the spray injection port It is characterized by being washed off with spray mist at the time of fountain solution ejection without adhering or accumulating .

  Preferably, the photocatalyst is arranged on the surface near the spray port and / or the inner wall of the spray port in addition to the periphery of the spray port. The vicinity of the spray nozzle is an area where a spray pattern is formed, and an area that affects the spray pattern by the adhesion or deposition of contaminants in the area. The expression “the photocatalyst is arranged” in the constitution of the present invention means that, for example, titanium dioxide is applied as the photocatalyst, and this is applied, applied and baked, vapor-deposited, vapor-deposited and fired, or the photocatalytic material itself is a nozzle. This includes technology such as

The present invention includes the following configurations.
(1) The light source is a lamp or a light emitting diode (LED) that emits ultraviolet light or visible light.
(2) The light source is turned on at least during the operation of the spray dampener device.
(3) A photocatalyst is disposed on the inner surface of the housing of the spray unit.

The spray dampener device for a printing press according to the present invention has a dampening water jetting area, a spray nozzle and a light source in front of the spray nozzle, the side facing and close to the surface of the dampening roller along the longitudinal direction of the dampening roller is opened. In the spraying unit with a housing structure, a photocatalyst is disposed in a portion where the deposition of contaminants in each spray nozzle causes the disturbance of the spray pattern, and a light source for irradiating the photocatalyst with light is disposed outside the spraying angle of the spray nozzle. and arranged inside the housing, the air flow in the vicinity of the nozzle ejection orifice by dampening water injection or dampening without attaching or depositing the contaminants are attracted by the air flow in the vicinity of the nozzle injection port after injecting the drop Succoth flushed with spray mist during water jetting, maintenance such nozzle replacement or cleaning Reduced and troubles during printing, such as printing failure and quality degradation due to nozzle clogging can be prevented. In addition, the spray pattern is not disturbed because the light source is located outside the spray spray angle. The position of the light source provided in the spray unit is not necessarily limited to the outside of the left and right spray injection angles in the longitudinal direction of the dampening roller as shown in FIG. 3, but may be outside the upper and lower spray injection angles as shown in FIG.

FIG. 1 is a side view showing a basic configuration of a spray dampener device for a printing press according to the present invention. FIG. 2 is a side view of a spray dampener device for a printing press. FIG. 3 is a plan view of a spray dampener device for a printing press. FIG. 4 is a side view showing a basic configuration of a dampener apparatus using a light source having a cylindrical or tube-shaped translucent cover. FIG. 5 is a plan view of the apparatus. FIG. 6 is a side view showing a basic configuration of a dampener apparatus using a light source having a dome-shaped translucent cover. FIG. 7 is a plan view of the dampener device. FIG. 8A is a side view of the spray nozzle. FIG. 8B is a top view of the spray nozzle. 8C is a cross-sectional view taken along the line aa in FIG. 8A. FIG. 9A is a side view of a full cone nozzle. FIG. 9B is a top view of the full cone nozzle. 9C is a cross-sectional view taken along the line aa in FIG. 9A.

Brief description of symbols

DESCRIPTION OF SYMBOLS 1 Plate cylinder 2 2nd dampening roller 3 1st dampening roller 4 Spray nozzle 5 Spray nozzle mounting frame 6 Spray unit housing 10 Spray unit 20 Light source 21 Translucent cover 43 Spray port 44 Nozzle wall 45 Surface near spray port 46 Inner wall of injection port 47 Around injection port

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram showing a partial configuration of an offset printing machine provided with a spray unit for a printing press (hereinafter referred to as a spray unit), and FIG. 2 is a side view showing a basic configuration of the spray unit of the present invention. 3 is a plan view of the apparatus.

  A first dampening roller 3 is disposed on the plate cylinder 1 via a second dampening roller 2, and a spray unit 10 is disposed across the entire width of the first dampening roller 3 so as to face the roller surface. As shown in FIGS. 3 and 4, the spray unit 10 has a spray nozzle mounting frame 5 having a housing 6 structure, and a plurality of spray nozzles 4 in which dampening water is mounted on the spray nozzle mounting frame 5. From the first dampening roller 3 to the plate cylinder 1 through the second dampening roller 2. The spray nozzle 4 is fixed to a spray unit structure (not shown) constituting the spray nozzle mounting frame 5. The arrangement and number of dampening rollers differ depending on the printing machine. Although this embodiment is described with a system using a dampening roller, a so-called dampening roller is formed by spraying dampening water directly onto the ink roller and emulsifying the dampening water into the ink thin film on the ink roller. The spray unit of the present invention can also be applied to a printing machine / printing system that does not use a printer.

As shown in FIG. 2, the housing 6 is provided so as to cover the upper side and the lower side of the fountain solution injection area in front of the spray nozzle 4, with the side facing the dampening roller 3 surface being opened and facing. The photocatalyst is disposed on the inner surface of the housing. A light source 20 is provided inside the housing 6, and the light source 20 is covered with a dome-shaped translucent cover 21. The light source 20 includes a light emitting diode (LED), a lamp that emits ultraviolet light or visible light, and is disposed outside the spray spray angle 4a of the spray nozzle 4 (see FIG. 3). The light source 20 is turned on over part or all of the operating time zone of the spray dampener device. If it is difficult to perform a sufficient photocatalytic function during the operation time due to the illuminance of the light source, the light source 20 may be lit even outside the operation time.

  The translucent cover 21 has a dome shape and is arranged toward the upper wall and the lower wall of the housing 6. The light source 20 is wired 22 from the upper wall or the lower wall of the housing 6. Reference numeral 7 is a drain port, and 8 is an exhaust port with a filter.

  Another embodiment of the light source will be described. FIG. 4 is a side view showing a basic configuration of a spray unit using another light source, and FIG. 5 is a plan view of the apparatus.

  The translucent cover 21 is formed in a cylindrical shape or a tube shape, and is disposed in the longitudinal direction of the housing 1 along the dampening roller 3. Inside the translucent cover 21, a light source 20 comprising a light emitting diode (LED) and a lamp that emits ultraviolet light or visible light is disposed outside the spray spray angle 4a of the spray nozzle 4 (see FIG. 5). The light source 20 is wired 22 from both end walls of the housing 6. The light source can also be attached and wired to the spray nozzle attachment frame 5.

  FIG. 6 is a side view showing a basic configuration of a spray dampener apparatus using another light source, and FIG. 7 is a plan view of the apparatus.

  The translucent cover 21 has a dome shape and is disposed side by side in the longitudinal direction of the housing 1 along the first dampening roller 3. A base 21 c is fixed to the lower wall of the housing 1, and a non-translucent cover 21 a that closes the open end of the translucent cover 21 is attached to a column 21 b attached to the base 21 c. Inside the translucent cover 21, a light source 20 composed of a light emitting diode (LED), a lamp that emits ultraviolet light or visible light is provided. The light source 20 is positioned outside the spray spray angle 4a of the spray nozzle 4 as shown in FIG. 7, and is wired from the lower wall of the housing 6 through the base 21c and the column 21b.

  The light source 20 and the translucent cover 21 are not limited to the above embodiment, and can be mounted and wired on the combination of FIGS. 3 and 5 or the spray nozzle mounting frame 5 and can be appropriately selected. The outer surfaces of the light source and the translucent cover are coated with a photocatalyst.

  The spray nozzle will be described. 8A is a side view of the spray nozzle, FIG. 8B is a top view of the spray nozzle, and FIG. 8C is a cross-sectional view taken along line aa of FIG. 8A.

  The spray nozzle 4 is fixed to the spray nozzle mounting frame 5 with a packing 41 interposed in the nozzle base 40. The fountain solution is supplied to the entrance base 42 and ejected from the ejection port 43. In general, in a spray unit, a spray pattern of dampening water sprayed from the spray port 43 is formed by changing the shape of the spray nozzle inner wall 46 and the spray nozzle periphery 47 in order to form a special spray pattern. Reference numeral 45 denotes a surface near the injection port formed outside the periphery of the injection port 47.

  The spray nozzle 4 of this example is provided with a nozzle wall 44 that faces the injection port 43 at the center. The nozzle wall 44 blocks the airflow that occurs in the housing from moving toward the injection port, and changes the airflow. Suppresses adhesion of causative substances even a little.

  On the other hand, in a spray unit using a spray nozzle of a fan shape, an elliptical shape, a full cone shape, a full cone shape, or a full polygon spray pattern, the spray nozzle has a special purpose to change the air flow like the nozzle wall 44. Has no protrusions. An example of the spray nozzle having the above-mentioned full cone spray pattern is shown in FIGS. 9A, 9B, and 9C. The spray nozzle 4 is formed with an annular wall around the front surface of the nozzle base, and a circular injection port 43 is provided at the inner center of the annular wall. Between the annular wall and the jet port periphery 46, a jet port vicinity surface 45 is formed.

  In either of the nozzles of FIGS. 8C and 9C, the spray nozzle periphery 47 refers to a portion between the nozzle inner wall 46 and the nozzle vicinity surface 45, and the spray nozzle periphery 47 is a contaminant that has accumulated or adhered. Is a portion that causes deformation of the spray pattern, and the surface near the spray port is a portion outside the spray port 47. However, since contaminants adhering to the surface 45 near the injection port may trigger the start of adhesion or deposition of contaminants around the spray injection port 47, it is desirable to place a photocatalyst on the surface near the injection port. Needless to say.

  When silica is added to the photocatalyst, the effectiveness of the photocatalyst is maintained, so that the photocatalyst disposed on the outer surface of the light source or the translucent cover can add silica.

Claims (6)

To be combined with an offset printing machine, a housing structure that is open along the longitudinal direction of the dampening roller and closes the surface facing the dampening roller surface and covers the dampening water spray area in front of the spray nozzle, the spray nozzle, and the light source. A spray dampener device for a printing press, comprising: a spray unit; and a plurality of spray nozzles that are provided inside a housing of the spray unit and spray dampening water toward the surface of the dampening roller. ,
Photocatalyst is arranged around the spray injection port of the spray nozzle, outside the light source spraying angle of the spray nozzle for applying light to the photocatalyst, and is disposed within the housing, the contaminants to the spray injection port A spray dampener device for a printing press, wherein the spray dampener device is washed away with a spray mist at the time of fountain solution ejection without adhering or accumulating . The spray dampener device for a printing press according to claim 1, wherein the photocatalyst is disposed on a surface near the injection port. The spray dampener device for a printing press according to claim 1, wherein the light source is a lamp that emits ultraviolet light or visible light. The spray dampener device for a printing press according to claim 1, wherein the light source is a light emitting diode. 2. The spray dampener device for a printing press according to claim 1, wherein the light source is turned on at least during the operation of the spray dampener device. The spray dampener device for a printing press according to claim 1, wherein a photocatalyst is disposed on an inner surface of the housing of the spray unit.

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